Ratchet chain breast-drill.



S. IVIcCLELLPJv.

BATCHET CHAIN BREAST DRILL;

APPLICATION FILED MAR- 29. I9l5'.

and a finger, or otherwise, as for instance, a,

stud-ended handle 15 which is supported when in use as a handle inan extension 16 of the cylinder or casing 2, said rodor screw 11 may be adjusted or turned so as to provide for the adjustment of the drill-stock thereon by hand, as conditions may suggest- A beveled gearing 16 and 17 ara-nged for actuating the drill-stock 1 and intergeared for their mutual actuation is arranged in connection with the knurled nut 12, the gear 17 having spaced studs or projections 18 thereon, said studs or projections being adapted to be engaged by an arm 19 carried by the master pinion or gear wheel 20 of the drill-stock actuating gearing, whereby said drill-stock may be auto- 'f matically and intermittently moved or actiiated, as in feeding said drill stock, with the drilh'to itswork. Thearm 19 is detach-ably or adj ustably connected to the inaster pinion 20, said arm having its vertical portion received within a passage in said pinion and engaged or held by a screw 21, it being understood, of course, thatl in the use of this arrangementmanual actuation of the knurled nut becomes unnecessary.

vrrlflie. master pinion 2O which is arranged upon a shaft 21 havingl its bearing in the casing or cylinder 2 has a supplemental beveled pinion or toothed formation S21,y

1V hen it is desired to bring the beveled tooth-formation or pinion 21a into gear with thefpinion 22 in order to vary the speed from a faster to a slower movement of the drill-actuating member 1,'the master pinion 20. together with the handle 23 and the 'l adjunctive parts thereof, are removed from thevsliaft 21 and said handle, with the pinions 20 and 21a are applied to a separate shaft 2l?, the toothed formation or pinion 21a then being intermeshed with the pinion 22. and which pinion QQ is fitted to the drillstock 1. said stock having slidable movement therethrough and held in connection with said pinion 22 in the usual way for rotation thereby' asthe master pinion is actuated. In either instance said pinion 2O Vis held upon its respective shaft by means of the thumb-nut 24.

The handle actuating member 23 of the shaft 21 of the pinion 20 is connected to the shaftvupon which it rotates by means of a collar ZLtQ'which collar is held to said shaft by means of a plurality of screws 25', said handle. however, having its shank portion applied to said shaft so as to freely turn thereon, said .shank portion being provided with pawls 25 vengaging a ratchet 26 on said shaft .of pinion 20, whereby as said handle Q3 is actuated, said pawls will be caused :to intermittently engage said ratchet and thus provide for actuating the master pinion shaft.` It will be noted that the handle menijber`23 ispivotally conneetedto ldisposing or adjusting the handle to its shank-portion to accommodate the grasping and manipulating of said handle in places where said handle in its other position could not be manipulated. The pawls are re siliently connected together at their outer ends by a spring 26, while intermediate projections 27 of said pawls are adapted to separately engage a fixture or stud 2S upon the shank portion of the handle 23, the saine being necessary for actuating said pawls` as the handle is operated.

A rod 0r member Q9 has a qiiiulrant-like connection 30 with the enlargement 113 of the casing 2, said quadrant being received between bifurcated extensions 31 of said enlargement and having a series of circu larly arranged perforations 31 any one of which may receive the thumb screw 3Q for the adjustment and retention of said member 29 at any desired angle it may be required within which to set the device to ellect the boring operation as in corners or otherwise inaccessible points` as will be readily understood. The member 29 is provided with a breast plate B3 of the usual construction as in applying the device for use.

It will be noticed that by the aforesaid arrangement of the drill-stock actuating mechanism. including more particularlj7 the housed portions thereof, said drill-stock will be prevented, as is apparent, from being exposed or subjected to a bending action as would otherwisD be the case, since said drillstock is held in true axial alinenient at all times with the direction of the boring opera-y tion and thus provided for facilitating the action of the parts and the boring operations, the advantages of which are ol'I the utmost importance. especially in a device of this character which will be appreciated.

The plate or member 3e is fitted to have a limited slidable movement upon the outer end of the casing 2 and is resiliently seated thereon by means of a spring 35 interposed between said plate or member 81 and a nut 36 applied to said casing. Said plate 34- is equipped with hooks 3T, themselves, also resiliently applied to the plate 3l by means of springs 88 applied to said hooks and interposed between headed ends of said hooks and said plate. The purpose of aforesaid arrangements of parts.l it will be noted` is to provide a yieldingr movement of the plate 31, with said hooks R7, when the instrument is in use which will prevent an excessive binding action of said parts, as. is thought, apparent. The hooks 37 are designed to receive means as a chain or equivalent means `for effecting connection between the outer l-laving thus described my invention what l claim as new and desire to secure by Letters latent is:

l. Apdevice of the character described, in cluding a tubular casing, a tubular drillstock arranged therein, a screw-threaded rod or shaft engaging said drill-stock, means for actuating said screw-threaded shaft, gearmechanism for rotating said drill-stock and additional intergeared mechanism arranged for automatically actuating said screwthreadedshaft.

EZ. A device of the character described, including a tubular member, a drill stock, a threaded rod engaging said drill-stock, a nut fixed to said rod and provided with a pinion toothed-like formation, a pinion engaging said toothed formation and means for rotating said drill-stock, provided with means for actuating said pinion7 and means for eliecting the rotation of said threaded rod by the actuation of the drill-stock rotating gear mechanism.

3. A device of the character described, ncluding a drill-stock, a threaded member engaging said drill-stock, means for rotating said threaded member, provided with a pinion toothed formation, said pinion being provided with spaced studs, gearing adapted to rotate said drill stock, provided with an arm for engaging said studs, and means for effecting the rotation of said threaded member by the drill-stocl rotating means.

il. A device of the type described, includ ing a tubular casing, a tubular drill-stock therein, a screw-threaded rod or shaft engaging said drill-stock, means for rotating said screw-threaded shaft, gear-mechanism for actuating said drill-stock, said means comprising a nut for rotating said screwthreaded shaft, intergeared mechanism for actuating said nut, having spaced projections thereon, said drill-stock actuating gear mechanism being provided Vwith an arm, adapted to engage said projections for automatically effecting the feeding of the drillstock, with the drill to its work, by the actuation of the drill-stock operating gearmechanism.

In testimony whereof I afia my signature in presence of tWo Witnesses.

STEPHEN MCCLELLAN.

Witnesses:

R. R. DUFFIE, M. C. PAPE.,

lllupica et this patent may be obtained for ve cents each. by addressing the Commissioner of Patents, Washington, D. C. 

